The redshirt senior and California native suffered his second concussion in a span of six months last week, and he had been experiencing symptoms that were believed to be related to heat exhaustion. However, it eventually was revealed that the effects were from a more serious condition.

Teammates were reportedly informed of the news during a team meeting, and this shocker comes on the heels of offensive lineman Chris Ward announcing last week he would medically retire as well.

UCLA also lost defensive end Sam Tai for the season after he tore his ACL. But losing Larimore, the anchor of the defense, is a serious blow to a unit that was looking to improve in Jim L. Mora's first year as head coach.

Larimore started all 13 games last year and was named the team's defensive player of the year after leading the team with 81 tackles. On a unit that was often considered soft in 2011, he brought a certain degree of toughness and was well-respected by teammates and the new coaching staff. Redshirt junior Todd Golper, who has battled injuries in the past, will likely step into Larimore's starting spot.

Email dave.miller@nationalfootballpost.com or follow me on Twitter at Miller_Dave

Welcome to National Football Post

Our mission is to provide you with the best insights and news from around the NFL and College football. Our team of insiders have been close to the game their entire careers and provide insights you won't find anywhere else. But it doesn't stop there. You are a pivotal part of our community. We have some exciting features through myNFP that we'll be releasing in the coming weeks. You can create scouting reports, build and share mock drafts, and get your take on the football world out there. Thank you for including us among the places you go to learn about the game you love.